- Time:Aug 30, 2023
Magnesia Iron Spinel Brick is a high-temperature refractory material composed of a spinel phase composed of magnesium oxide (MgO) and iron oxide (Fe2O3). The following are common physical and chemical indicators of magnesia-iron spinel bricks:
1、chemical composition:
1.1 MgO content: usually between 60-85%, the specific content varies according to different manufacturers and products.
1.2 Fe2O3 content: usually controlled between 5-25%.
2. Common physical properties:
2.1 Bulk density: usually between 3.0-3.7 g/cm³, the specific value depends on the formula and production process.
2.2 Compressive strength: generally between 40-100 MPa, the strength can be adjusted by adding suitable aggregates and binders.
2.3 Mass Loss: Mass loss tests are performed at elevated temperatures to assess the resistance of bricks to chemical attack.
2.4 Coefficient of Thermal Expansion: A measure of how much a material expands linearly as it heats up.
2.5 Load softening temperature: refers to the temperature at which a material begins to soften under a specific load.
3. Thermal performance:
3.1 Refractoriness (fire resistance limit): refers to the ability of a material to resist high temperature environments. Magnesia-iron spinel bricks have good refractory properties and can usually be used at high temperatures above 1500°C.
3.2 Thermal conductivity: Measures the ability of a material to conduct heat. For bricks, it is generally between 1-3 W/m·K.
Physical and chemical indicators of magnesia-iron spinel bricks produced by zhenjin
| Brand | Grade | ||
| ZJMI | ZJMIA | ||
| Chemical Composition wt(%) |
Mgo | ≥88 | ≥85 |
| Fe,0, | 3.5-4.5 | 3.0-4.0 | |
| AlL03 | 3.5-4.5 | ≥8 | |
| Sio2 | ≤0.8 | ≤0.7 | |
| cao | ≤1.2 | ≤1.2 | |
| Bulk density(g/cm3) | ≥2.97 | ≥2.95 | |
| Apparent porosity(%) | ≤17 | ≤17 | |
| Normal temperature compressive strength（MPa) | ≥70 | ≥70 | |
| Load softening start temperature (0.2MPa,to.6) | ≥1700 | ≥1700 | |
| Thermal shock stability, times (1100℃, water cooling) | ≥10 | ≥12 | |
It should be noted that the specific physical and chemical indicators may vary due to different manufacturers, product specifications and application requirements. Therefore, when selecting and using magnesia-iron spinel bricks, it is recommended to refer to the technical data and technical specification sheets provided by the supplier to ensure that they meet specific engineering needs.
